The answer is 48720.

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1) the tire's wear in the ratio 46400/33600 = 29/21

2) let life of 1 Tyre be x. we have 5 tires so their combined life is 5x. we have to divide this combined life in the ratio 29/21

3) (5x / 50) * 21 * 46400 = 2.1(x) * 46400 is the amount both the front tire's will travel.

which is 97440.since we have to find for individual tire it will be 97440/2 = 48720